Revert "Changed a bunch of CGridAdaptation to be unsigned long rather than int"

This reverts commit f2fc1fe4a578c89aebb09177b38458553367f965.
Made shat only limited once (not twice with Omega)
Made cb2/sigma precomputed constant in SU2
Merge branch 'master' of https://github.com/su2code/SU2 into feature_TNE2